Evaluation of the spatial inhomogeneities of ferrofluid thin plates polarimetric characteristics for active imagery

Pierre-Yves Gerligand; Bernard Le Jeune; Jack Cariou; Jean Lotrian

doi:10.1117/12.186670

14 September 1994 Evaluation of the spatial inhomogeneities of ferrofluid thin plates polarimetric characteristics for active imagery

Pierre-Yves Gerligand, Bernard Le Jeune, Jack Cariou, Jean Lotrian

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Proceedings Volume 2265, Polarization Analysis and Measurement II; (1994) https://doi.org/10.1117/12.186670
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

When a static magnetic field, perpendicular to the propagation direction of a laser beam is applied to a magnetic liquid, birefringence and dichroism can be present in this material. These properties have been used to realize an adjustable wave plate for polarimetric modulation applications in active imagery. The first measurements of the linear birefringence have been made by using a continuous laser source and the results have shown the possibility for such a material to realize polarimetric modulation. So we have to obtain a good spatial homogeneity of the polarimetric properties of the retardation plate. This measurement method has been developed in the case of an imagery application using a pulsed laser beam: in this case the temperature effects which could appear in the first set up are removed. Results show the possibility to develop adjustable wave plates based on ferrofluids for which it is possible to make polarimetric modulation at high speed.

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Pierre-Yves Gerligand, Bernard Le Jeune, Jack Cariou, and Jean Lotrian "Evaluation of the spatial inhomogeneities of ferrofluid thin plates polarimetric characteristics for active imagery", Proc. SPIE 2265, Polarization Analysis and Measurement II, (14 September 1994); https://doi.org/10.1117/12.186670

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KEYWORDS

Magnetism

Birefringence

Polarimetry

Dichroic materials

Particles

Temperature metrology

Tantalum

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